1. You'd better not eat too much candies because they are not good for your teeth.
2. Last year, my brother woked as an engineer at a printing factory. 
3. "Balance diet" means you have to/should/must eat variety of foods without eating much of anything. 
4. Children should spend only a small part of their free time on playing electronic games.
5. This morning, I ate bread and drank milk for breakfast.